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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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IR Frequency Region: Fingerprint Region01:03

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the C=O, C=N, and C=C occur between 1600–1850 cm−1.
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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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Published on: December 30, 2025

Birefringent prism based Fourier transform spectrometer.

Chu-Yu Huang1, Wei-Chih Wang

  • 1Department of Mechanical Engineering, University of Washington, Seattle, Washington 98195, USA.

Optics Letters
|May 5, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces a novel, compact Fourier transform spectrometer (FTS) without moving parts. This innovative design significantly reduces measurement times and enhances reliability for spectral analysis.

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Area of Science:

  • Spectroscopy
  • Optical Engineering
  • Instrumentation

Background:

  • Traditional Fourier transform spectrometers (FTS) often involve moving parts, leading to reliability issues and longer measurement times.
  • Existing FTS designs can be bulky and complex, limiting their field applicability.
  • There is a need for compact, robust, and rapid spectral measurement devices.

Purpose of the Study:

  • To present the design and validation of a novel, compact Fourier transform spectrometer (FTS).
  • To demonstrate an FTS design that eliminates moving parts by spatially encoding optical path difference (OPD).
  • To evaluate the performance and accuracy of the developed FTS prototype.

Main Methods:

  • Design of a rugged and compact FTS using a birefringent prism, polarizers, and a linear CCD array.
  • Spatial encoding of optical path difference (OPD) to eliminate the need for temporal scanning and moving components.
  • Experimental validation using LEDs of known wavelengths and employing fringe counting for accurate interferogram sampling.

Main Results:

  • The developed FTS prototype is compact, rugged, and eliminates moving parts.
  • Measurement times are dramatically reduced compared to traditional scanning FTS systems.
  • Spectral reconstruction demonstrated high accuracy, with detected wavelengths deviating by less than 1 nm from actual values.

Conclusions:

  • The proposed birefringent prism-based FTS offers a significant advancement in spectrometer design.
  • The elimination of moving parts enhances reliability and reduces system size and cost.
  • This compact and rapid FTS is suitable for various applications requiring accurate spectral analysis.